We used a Hobie Mirage i14t (inflatable tandem).
The beauty is that it is pedal driven (as well as paddle driven) so it's hands-free operation (you can use binoculars or camera
We stored it inflated in garhauer racks outboard
of the lifelines
and made a bridle
to raise and lower it with the spinnaker halyard
Fantastic kayak. We could stand up in it easy -- extremely stable. Loads of fun. Great exercise. Good platform for cleaning
the sides of the boat. If you have a large locker you could store it deflated, but the bag is quite large.
For pics and more info, see this:
Hobie i14t Tandem Inflatable Kayak